Brake shoe



Oct. 9 1923.

C. D. PETTIS BRAKE SHOE Filed Sept. 2. 1922 4 Sheeas-Sheerl 1 C. D.PET-ns BRAKE SHOE Filed sept. 2, 1922 4 sheets-sheet 2 1l/ym P v uw iumQBSWSM.

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C. D. PETTIS BRAKE SHOE Filed Sept. 2. 1922 4 Sheets-Sheet l uw vPatented Oct. 9, 1923.

CLIFTON D. PETTIS, 0F NEW YORK, N. Y.

BRAKE SHOE.

Application led September 2, 1922. Serial No. 585,903.

To all 'whom t `may concern:

Be it known that I, CLIFTON D. Perris, a citizen of the United States,residing in New York, in the county ofNew York and State of New York,have invented certain new and useful Improvements in yBrake Shoes, ofwhich the following is a specification.

My invention relates to brake shoes, but more particularly to thesectional type, in which the cast body is divided transversely into twoor more parts joined by a reinforcing back of tough ductile metal, andhas for its primary object to `provide an improved construction of thistype which may be economically produced and which is more strong anddurable than devices of a similar character heretofore known.

The many other objects and advantages of my invention will be betterunderstood by reference to the following specification when consideredin connection with the accompanying drawings illustrating selectedembodiments thereof, in which Fig. 1 is a side elevation of the brakeshoe complete;

Fig. 2 is a section on the line 2-2 of Fig. 1.

ig. 3 is an enlarged transverse section on the llne 3-3 of Fig. 1;

Fig. 4 is an enlarged transverse section on the line 4 4 of Fig. 1;

Fig. 5 is an enlarged transverse section on the line 5-5 of Fig. 1;

Fig. 6 is a detail side elevation of the back plate shown in`Fig. 1;

Fig. 7 is a' top plan view of the plate shown in Fig. 6;

Fig. 8 is an enlarged transverse section on the line 8-8 of Fig. 7;

Fig. 9 is a side elevation of a modified form of back plate;

Fig. 10 is a side elevation of a modified form of brakeshoe.

Fi -11 is an inverted sectional plan on the line 11--11 of Fig. 10;

Fig. 12 is an enlargd transverse section on the line 12-12 of i 10;

Fig. 13 is an enlarge transverse section on the line 13-13 of Fig. 10;

Fig. 14 is a transverse section on the line 14--14 of Fig. 10;

l Fig. 15 is a side elevation of a modified ing members 35 which arebent form of the brake shoe shown in Fig. 1, and

Fig. 16 is a side elevation of a'modified forni of the brake shoe shownin Fig. 10.

Referring to the` drawings and particularly to Figs. 1 to 9 inclusive,the brake shoe comprises Ia back plate 25, a key lug 26, and lugs 27, aplurality of individual reinforcing members 28, and a cast body 29. Thereinforcing members or shells 28 are arranged end to end and are securedto the back 25 by a series of bent down lugs 30. These shells 28, in thepresent embodiment, are constructed in the form of cages or pockets ofreticulated or expanded metal and the pockets are connected through themedium of the yback plate 25. The body of the shoe is dividedtransversely into sections 31 each incorporating one of the reinforcingshells 28.

ugs SOare preferably y struck downwardly from the body of the back 25and are bent laterally beneath the body of the plate after the shellslhave been placed in proper position relative thereto.' These lugs 30provide a locking engagement between the back and the cages in themanner indicated.

The key lug 26 is provided with attachdownwardly and inserted throughslots 36 provided for the purpose in the back plate 25 and the lowerportion of these members .is then bent upwardly beneath the plate andthe upper portions of the corresponding reinforcing shells 28 to securethe lug upon the plate and provide an additional attachment between theplate and the shells.

The end lugs 27 are formed by bending upwardly and then downwardly theend ortions ofthe back plate to form upstan in ribs of double thicknessof metal. These en lugs extend completely across the back plate. Guideflanges 37 are struck up from the plate 25 and then bent downwardly toprovide a double thickness of metalsimilar in form to the end lugs 27.The prongs 30ll on the end lugsmay be bent upwardly beneath the body ofthe plate in the same manner as the lu s 30.

ach of the shells 28 is composed of sides 40, end Walls 41 and a top 42,the baskets being open at the bottom. These shells may be made ofexpanded metal, wire fabric, or other material suitable for the purpose.A

slight interval43 is preferably provided between the end walls ofadjacent shells when the same are attached to the reinforcing back. Thisinterval is maintained between the body sections cast thereon andpermits a certain yielding of the shoe to conform to variations in thediameter of the car wheel, also variations in the radius of the face ofthe shoe from variations in temperature. Oifsets 25 are preferablyformed 1n the back 25.

lIn the assembling of the shoe the back late is formed in the mannerillustrated 1n igs. 6 to `9, with the lugs 30 bent downwardly from thereinforcing plate. The shells 28 are then placed in position on theunder face of this plate. Certain of the lugs 30 project throughopenings in the shells and others extend outside the same. lugs 30 arenow bent up to bind the shells tightly in place on the under face of theback. The center lug 26 is attached in the manner described and thesections of the shoe are cast upon the combined back and shells in theusual manner. In the modied form of reinforcing back 50, shown in Fig. 9the key lug 51 1s formed integral with the back instead of separatetherefrom and attached thereto.

This form of brake shoe is very ,advantageous as each of the sections ofthe shoe is thoroughly reinforced by the individual ductile metal shellor pocket embedded therein and the various sections are securely-connected by the back plate. The `lugs 30 firmly secure the shells 28upon the back plate prior to the casting of the body and this body addsto the strength of the attachment.

In the modified form of the invention shown in Figs. 10 to 14 inclusive,the ductile metal reinforcin back is provided with side walls 56 an endwalls 57 of reticulated metal. The side walls 56 are dividedtransversely as at 58 and a sectional shoe 59 is cast on the back withthe divisions between Y sections corresponding to the divisions in theside walls of the back. A substantially T-shaped opening is providednear each end of the reinforcing back to permit the east metal of thebody to pass .therethrough and form the end lugs 60. The key lug 61 isattached to the reinforcing back prior to the casting of the bodythereon. This form of brake shoe is substantial( in construction, as thereticulated side and end walls of the back plate, are embedded in` thebody of the slioe and the entire shoe is sufficiently flexible'toprovide for any variations which may occur in the diameter of the carwheel or in the radius of the face of the shoe from varia tions intemperature. f -v v In the modified form of the.. invention shown in Fi15 the slots 7() between the sections 71 of the shoe taper from the faceof, the shoe to the' back insteadof having Thesel thesubstantiallyparallel walls shown in Fig. 1. This cnstruction isadvantageous. Fig. 16 shows a similar modification of the brake shoeillustrated in Fig. 10 in which the walls of the slots 72 between thesections 7 3 are likewise tapered.

I am aware that various other changes in the form and arrangement of theparts may be made without departing from the spirit of my invention, andI reserve the right to make all such as fall within the scope of thefollowing claims.

I claim:

1. A brake shoe comprising a reinforcing shell having the side wallsthereof oppositely divided transversely of the shoe, and a sectionalbody cast on said shell with the divisions between sections coincidingwith the 'corresponding divisions in the side walls of the shell.

2. A brake shoe comprising a transversely divided sectional shell, and atransversely divided sectional body cast on said shell with thesectional division of the body coinciding with the correspondingdivisions of said shell.

3. A brake shoe comprising a plurality of cast sections each providedwith individual reinforcement embedded therein.

4. A brake shoe comprising a plurality of cast sections each .providedwith individual reinforcement embedded therein, and a ductile metal backconnecting said reinforcements.

5. brake shoe com rising a ductile metal reinforcing back an a pluralityof cast metal body sections having individual reinforcing shellsembedded therein and attached to said back.

6. Abrake shoe com risin reinforcing back, and) a plurality' of castbody sections having individual reinforcin shellsembedded therein andattached to said back by lugs formed -on said back. v

7. 'A brake shoe comprising a plurality of cast,body sections providedwith individual reinforcing pockets of reticulated metala duct-ile metalcast body sections arranged end to end and having individual reinforcingshells of reticulated metal each including a top, sides, and end walls.

9." A brake shoecom rising a transversely divided sectional she 1, atransversely divided sectional body cast on said shell with thesectional division of the body coincidin with the correspondingdivisions of sai shell, andv a back plate connecting the shell sections.

10. A brake shoe comprising a reinforcing shell havin the side wallsthereof oppositely divide transversely of the shoe, and a sectionalbody'cast on said shell with the divisions between sections coinciding-Vwith the corresponding divisions in the side walls of the shell, theslots formed between the opposing end'walls of the sectionsta.- peringtoward the back 'of the shoes.

11. A brake shoe comprising a back hav- 5 ing a transversely dividedsectional shoe body cast thereon, the slots formed between the opposingends of the shoe sections ta.- pering from the face of the shoe to theback.

l2. Av brake shoe comprising a ductile metal reinforcing back having etransverse- 1y divided sectional shoe cast thereon, the opposing endwalls of the sections being opposiely inclined to form tapering slotsbetween the sections.

CLIFTON D. RETTIS.

